21260541343265 has 32 divisors (see below), whose sum is σ = 30173549621760. Its totient is φ = 14070899404800.

The previous prime is 21260541343259. The next prime is 21260541343271. The reversal of 21260541343265 is 56234314506212.

It is an interprime number because it is at equal distance from previous prime (21260541343259) and next prime (21260541343271).

It is not a de Polignac number, because 21260541343265 - 2¹⁸ = 21260541081121 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 919616 + ... + 6585345.

It is an arithmetic number, because the mean of its divisors is an integer number (942923425680).

Almost surely, 2^{21260541343265} is an apocalyptic number.

It is an amenable number.

21260541343265 is a deficient number, since it is larger than the sum of its proper divisors (8913008278495).

21260541343265 is a wasteful number, since it uses less digits than its factorization.

21260541343265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7507793.

The product of its (nonzero) digits is 1036800, while the sum is 44.

Adding to 21260541343265 its reverse (56234314506212), we get a palindrome (77494855849477).

The spelling of 21260541343265 in words is "twenty-one trillion, two hundred sixty billion, five hundred forty-one million, three hundred forty-three thousand, two hundred sixty-five".